In the past fife years, Fraunhofer Institute for Photonic Microsystems
IPMS in Dresden developed a new type of micro scanning mirror called
LinScan. The new technology is especially suitable for beam steering
and pico-laser-projection display applications.
Various applications like barcode readers, scanning grating
spectrometers or light detection and ranging (LIDAR) require dynamic
deflection of light. Micro scanning mirrors are the cutting edge
technology when it comes to providing robust and cost efficient
scanning capabilities for ultra mobile and low power consumption
applications. The novel device concept LinScan allows for static
actuation of certain deflection positions in a continuous scan range as
well as linear scanning about one of optionally two scan axes. Hence it
can be utilized for applications that could not be addressed with
Fraunhofer IPMS’s existing resonant micro scanning technology.
With LinScan even large mechanical scan angles of about
±11,5° can be addressed statically and point by point.
»This is very important for beam steering applications like laser
marking and writing«, says Denis Jung, who developed the LinScan
device concept within his doctoral thesis. Furthermore the so called
quasistatic scan regime allows to dynamically modify the scan
trajectory. For example with LinScan a saw tooth shaped scan trajectory
can be realized which enables line-wise writing of images in
pico-laser-projection displays. The line-wise scan pattern enhances
picture resolution and contrast compared to existing resonant scanning
mirrors. »First demonstrator samples, which are now available for
evaluation by customers show the capability of SVGA resolution«,
explains Denis Jung and points out »LinScan devices use the
electrostatic driving principle and hence consume significantly less
power than competitive electromagnetic micro scanning mirrors with a
comparable performance level«.
More information at http://www.ipms.fraunhofer.de/